/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v4.view;

//import android.os.Build;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;

/**
 * Helper for accessing features in {@link ViewGroup} introduced after API level
 * 4 in a backwards compatible fashion.
 */
public class ViewGroupCompat {

	interface ViewGroupCompatImpl {
		public boolean onRequestSendAccessibilityEvent(ViewGroup group, View child, AccessibilityEvent event);
	}

	static class ViewGroupCompatStubImpl implements ViewGroupCompatImpl {
		public boolean onRequestSendAccessibilityEvent(ViewGroup group, View child, AccessibilityEvent event) {
			return true;
		}
	}

	/*
	 * static class ViewGroupCompatIcsImpl extends ViewGroupCompatStubImpl {
	 * 
	 * @Override public boolean onRequestSendAccessibilityEvent( ViewGroup
	 * group, View child, AccessibilityEvent event) { return
	 * ViewGroupCompatIcs.onRequestSendAccessibilityEvent(group, child, event);
	 * } }
	 */
	static final ViewGroupCompatImpl IMPL;
	static {
		// if (Build.VERSION.SDK_INT >= 14) {
		// IMPL = new ViewGroupCompatIcsImpl();
		// } else {
		IMPL = new ViewGroupCompatStubImpl();
		// }
	}

	/*
	 * Hide the constructor.
	 */
	private ViewGroupCompat() {

	}

	/**
	 * Called when a child has requested sending an {@link AccessibilityEvent}
	 * and gives an opportunity to its parent to augment the event.
	 * <p>
	 * If an {@link AccessibilityDelegateCompat} has been specified via calling
	 * {@link ViewCompat#setAccessibilityDelegate(View, AccessibilityDelegateCompat)}
	 * its
	 * {@link AccessibilityDelegateCompat#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)}
	 * is responsible for handling this call.
	 * </p>
	 * 
	 * @param group
	 *            The group whose method to invoke.
	 * @param child
	 *            The child which requests sending the event.
	 * @param event
	 *            The event to be sent.
	 * @return True if the event should be sent.
	 */
	public static boolean onRequestSendAccessibilityEvent(ViewGroup group, View child, AccessibilityEvent event) {
		return IMPL.onRequestSendAccessibilityEvent(group, child, event);
	}
}
